I found what I need in an electronics store.  The product is a "4 pole aux extension."  They are normally used with audio equipment.  Bachmann used a 4 pole aux plug to connect the track to the controller.

What kind of plug connects the hard wired track power wire to the electronic reversing controller.  I am trying to make or find an extension cord with compatible male and female connector ends.

My Christmas trolley auto reverses in the barn and at the end of the run.  Can I add an automatic passenger stop in the middle of the run?  I would like the trolley to continue in the same direction after the passenger stop.
 

Thanks for the help.  I am ready to try.

How do I remove the roof to troubleshoot failure if the interior lighting system?